UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 5, No. 18, pp. 275-283, Pis. 23-24 ANDREW c. lawson. Editor 



NOTES ON ECHINOIDS FROM THE 

 TERTIARY OF CALIFORNIA 



BY 



R. W. Pack. 

 CONTENTS. 



PAGE 



Introduction 275 



Spatangus ( ?) paehecoensis, n. sp 276 



Scutella fairbanksi Arnold 276 



Scutella (?) norrisi, n. sp 277 



Scutaster, new genus 278 



Seutaster andersoni, n. gen. and sp. 278 



Astrodapsis fernandoensis, n. sp. 279 



Astrodapsis antiselli Conrad, n. var. arnoldi 279 



Eehinarachinus exeentricus Eschscholtz 281 



Echinarachinus gibbsii Eemond 282 



INTRODUCTION. 



The following notes were prepared in the course of an exam- 

 ination of an extensive series of the Tertiary echinoids of Cali- 

 fornia carried on by the writer during- the past year. Much of 

 the material was obtained by Professor John C. Merriam, and the 

 study of it was commenced by him. For some excellent material 

 the writer is indebted to Professor James Perrin Smith, to Dr. 

 Ralph Arnold, and to Mr. Frank M. Anderson. It has been 

 thought advisable to include descriptions of one or two of the 

 known species for which the existing descriptions are meager, as 

 well as to describe and figure the new forms. 



